from abu Ja‘far (a.s) who has said the following.
"When al-Qa’im, (the one who will rise with Divine Authority) the guardian, of our family will appear from occultation, Allah will place His hand over the heads of His servants and, thus, He place their intelligence together and complete their understanding."
عَنْ أَبِي جَعْفَرٍ(علیه السلام) قَالَ إِذَا قَامَ قَائِمُنَا وَضَعَ اللّهُ يَدَهُ عَلَي رُءُوسِ الْعِبَادِ فَجَمَعَ بِهَا عُقُولَهُمْ وَ كَمَلَتْ بِهِ أَحْلَامُهُمْ